Investigationg of Chemical and Physical Changes

Investigationg of Chemical and Physical Changes

Why I am conducting this experiment?

In order to learn how to recognize chemical and physical changes, I

have to carry out this experiment to see different chemical and

physical changes of different substance.

How can we recognize physical changes and chemical changes?

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A chemical change involves a creation of a new substance, but a

physical change doesn’t involve any creation of any substance. For

example, if a piece of chalk drops on the floor and separates into a

few small pieces, it’s a physical change, because only the shape of

the chalk changed, but no new substance is involved, but if a piece of

sodium drops into water, gas comes out, and causes a “pop” sound, that

is a chemical change because gas has been formed when sodium dropped

in the water.

Hypothesis

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Hypothesis for the experiment:

After I conduct this experiment, I expect and suppose I can recognize

and physical changes, identifying the difference these two kinds of

changes. Also, I will be able to know some physical and chemical

properties of copper (II) sulfate, water, iron, sodium carbonate,

hydrochloric acid and magnesium and identify if it is a chemical

change or physical change in each part of the experiment.

Materials

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Refer to Chemistry Lab # 2 – Investigating Changes. No changes have

been made in this experiment.

Methods

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Refer to Chemistry Lab # 2 – Investigating Changes. No changes have

been made in this experiment.

Results

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I completed a table to show my results, here is the table:

Table 1. Results of different changes of substances

Part A

Copper (II) Sulfate and Water

Reactant description

Water (reactant):

Color: Colorless

Transparency: Clear, light can pass through

Easily

State: Liquid Smell: Odorless

Weight: Light